US3760564A - Process for the removal of acidic gases from a gas mixture - Google Patents
Process for the removal of acidic gases from a gas mixture Download PDFInfo
- Publication number
- US3760564A US3760564A US00236161A US3760564DA US3760564A US 3760564 A US3760564 A US 3760564A US 00236161 A US00236161 A US 00236161A US 3760564D A US3760564D A US 3760564DA US 3760564 A US3760564 A US 3760564A
- Authority
- US
- United States
- Prior art keywords
- gas mixture
- ketone
- branched chain
- carbon dioxide
- chain aliphatic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000007789 gas Substances 0.000 title claims abstract description 67
- 230000002378 acidificating effect Effects 0.000 title claims abstract description 15
- 239000000203 mixture Substances 0.000 title claims description 46
- 238000000034 method Methods 0.000 title claims description 31
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 61
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 31
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims abstract description 31
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 30
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 18
- 239000001257 hydrogen Substances 0.000 claims abstract description 18
- 125000001931 aliphatic group Chemical group 0.000 claims abstract description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 13
- 229930195733 hydrocarbon Natural products 0.000 claims description 7
- 150000002430 hydrocarbons Chemical class 0.000 claims description 7
- 150000002576 ketones Chemical class 0.000 claims description 7
- KOKPBCHLPVDQTK-UHFFFAOYSA-N 4-methoxy-4-methylpentan-2-one Chemical group COC(C)(C)CC(C)=O KOKPBCHLPVDQTK-UHFFFAOYSA-N 0.000 claims description 6
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical group CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 claims description 4
- 125000000217 alkyl group Chemical group 0.000 abstract description 8
- 125000004435 hydrogen atom Chemical group [H]* 0.000 abstract description 4
- 239000008246 gaseous mixture Substances 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 230000002745 absorbent Effects 0.000 description 8
- 239000002250 absorbent Substances 0.000 description 8
- 125000004432 carbon atom Chemical group C* 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- -1 ether ketones Chemical class 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 5
- 238000011282 treatment Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000003637 basic solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 125000000468 ketone group Chemical group 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000001991 steam methane reforming Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- PQEZBKJZUVIIDI-UHFFFAOYSA-N 3-(2-methylpropoxy)butan-2-one Chemical compound CC(C)COC(C)C(C)=O PQEZBKJZUVIIDI-UHFFFAOYSA-N 0.000 description 1
- ANVYHGLGEIIPRZ-UHFFFAOYSA-N 3-hydroxy-3-methyloctan-4-one Chemical compound CCCCC(=O)C(C)(O)CC ANVYHGLGEIIPRZ-UHFFFAOYSA-N 0.000 description 1
- WIDVGAUYQJKBRR-UHFFFAOYSA-N 3-methoxy-3-methyl-2-butanone Chemical compound COC(C)(C)C(C)=O WIDVGAUYQJKBRR-UHFFFAOYSA-N 0.000 description 1
- WOYGWXXUASQGEF-UHFFFAOYSA-N 4-hydroxy-4-methylhexan-3-one Chemical compound CCC(=O)C(C)(O)CC WOYGWXXUASQGEF-UHFFFAOYSA-N 0.000 description 1
- LTQRLPBCWUEVFY-UHFFFAOYSA-N 4-methoxy-3,4-dimethylpentan-2-one Chemical compound COC(C)(C)C(C)C(C)=O LTQRLPBCWUEVFY-UHFFFAOYSA-N 0.000 description 1
- GNNBSAPGFGNCCT-UHFFFAOYSA-N 5-hydroxy-5-methylhexan-2-one Chemical compound CC(=O)CCC(C)(C)O GNNBSAPGFGNCCT-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000004517 catalytic hydrocracking Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- XNLICIUVMPYHGG-UHFFFAOYSA-N pentan-2-one Chemical compound CCCC(C)=O XNLICIUVMPYHGG-UHFFFAOYSA-N 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000000629 steam reforming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/16—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids
Definitions
- Acidic gases such as carbon dioxide and hydrogen sulfide are selectively absorbed from gaseous mixtures with the use of a branched chain aliphatic mono-ketone of the formula Bell ' wherein R, R and R are alkyl groups, R is hydrogen or alkyl, R, is an alkylene radical and n is an integer from Oto l.
- the invention relates to a process for the removal of acidic gases such as carbon dioxide and/or hydrogen sulfide from a gas mixture containing such compounds.
- carbon dioxide and/or hydrogen sulfide can be removed from gas mixtures such as natural gas and synthesis gas by treatment with basic solutions.
- Gas mixtures such as natural gas and synthesis gas
- Carbon dioxide and/or hydrogen sulfide are bound to the basic materials present in the solution by chemical reaction. Regeneration of the solutions is effected by heating which causes the carbon dioxide and /or hydrogen sulfide to be released therefrom.
- Such methods based on chemical absorption, are very suitable when the carbon dioxide and/or the hydrogen sulfide have a relatively low partial pressure. With higher partial pressures, however, the saturation point of the basic solutions will soon be reached. For that reason carbon dioxide and/or hydrogen sulfide at relatively high partial pressures are preferably removed from gas mixtures by physical absorption in an inert liquid. With this type of absorption the quantity of acid gases absorbed increases with the partial pressure.
- Gas mixtures containing carbon dioxide and/or hydrogen sulfide at a relatively high partial pressure can result in a number of ways.
- natural gas containing considerable quantities of carbon dioxide and/or hydrogen sulfide is often obtained at high pressures.
- hydrogen sulfide is poisonous, has an obnoxious odor and is converted to sulfur dioxide upon combustion which may contribute towards air pollution.
- Carbon dioxide on the other hand, has an unfavorable influence on the calorific value of the gas per unit volume and may also give rise to undesirable deposition of solid carbon dioxide if the gas is transported in the liquid state, for example, in refrigerator ships or pipelines.
- Another example of a gas mixture which typically contains carbon dioxide and possibly hydrogen sulfide at high partial pressures is crude hydrogen as obtained from the shift convertor of a steam-methane reforming or gasification process.
- Hydrogen at high pressure is required in a number of catalytic processes in the petroleum industry, such as hydrocracking, desulfurizing and other treatments of petroleum fractions under hydrogenating conditions.
- the hydrogen needed is generally prepared by steam reforming of volatile hydrocarbon mixtures (for example, natural gas and light petroleum distillate fractions), or by partial oxidation of hydrocarbon mixtures, such as natural gas, fuel oil, bitumen and other materials containing carbon and hydrogen.
- the hydrogen which becomes available in these processes contains carbon dioxide and, depending on the starting material, may contain hydrogen sulfide as well.
- the carbon dioxide and/or hydrogen sulfide After compression the carbon dioxide and/or hydrogen sulfide have a considerable partial pressure and are therefore more desirably removed by physical absorption in an inert liquid than by chemical absorption as hereinbefore discussed.
- Physical absorbents employed for the removal of carbon dioxide and/or hydrogen sulfide from hydrogen and/or hydrocarbon-containing gas mixtures such as described above must not only have a high absorption capacity for carbon dioxide and hydrogen sulfide at high pressures, but must additionally release these gases easily when the pressure is reduced in order to effect their regeneration. Moreover, physical absorbents must also have a high selectivity for carbon dioxide and hydrogen sulfide in comparison with the absorption of hydrogen and hydrocarbons. The physical absorbent must also be chemically inert in respect of the components of the gas mixture to be treated, and must, in addition, be non-corrosive. The present invention provides a class of compounds meeting these requirements.
- Branched chain aliphatic mono-ketones of the type defined by the above formula include both hydroxy ketones and ether ketones.
- Examples of compounds in accordance with the invention which contain a hydroxyl group as well as a ketone group are 2-hydroxy-2-methyl-S-butanone, 3- hydroxy-3-methyl-4-hexanone, 2-hydroxy-2-methyl-5- hexanone, 3-hydroxy-3-methyl-4-octanone and 2- hydroxy-2-methyl-4-pentanone.
- the preferred compound in this group is 2-hydroxy-2-methyl-4- pentanone.
- Examples of suitable compounds containing a ketone group and also an ether group are 2-methoxy-2-methyl- 3-butanone, 3-ethoxy-3-methyl-4-hexanone, 2- isopropoxy-2-methyl-5-hexanone and 2-methoxy-2- methyl-4-pentanone and 2-methoxy-2,3-dimethyl-4- pentanone.
- 2-methoxy-2-methyl-4- pentanone has been found to be particularly advantageous in the present process.
- the present process is applicable to the treatment of most any gas mixture containing acidic gas constituents as impurities. It is particularly suitable for the treatment of gas mixtures which contain hydrogen and/or normally gaseous hydrocarbons, e.g., natural gas, crude hydrogen from steam methane reforming, synthesis gas from gasification processes and the like.
- gas mixtures which contain hydrogen and/or normally gaseous hydrocarbons, e.g., natural gas, crude hydrogen from steam methane reforming, synthesis gas from gasification processes and the like.
- the gas mixtures from which carbon dioxide and/or hydrogen sulfide must be removed are preferably contacted with the liquid at ambient or near-ambient temperatures, in general between 10 and 50C. Lower temperatures, for example down to 50C, are suitable, however. Naturally the ketone compound (or the mixture of ketones) with which the gas mixture is contacted must be liquid at the contact temperature.
- the absorption and release of the carbon dioxide and the hydrogen sulfide by the liquid according to the invention take place practically without heat effect, so that heating or cooling devices for the liquid are generally not required at operations near ambient temperature.
- Contacting of the gaseous mixture with the liquid absorbent according to the invention is preferably carried out countercurrently, in an absorption tower which is provided with appropriate contact means.
- the liquid is generally allowed to flow or drip from top to bottom while the gas mixture to be purified passes from bottom to top.
- the pressure in the absorption tower is kept at that of the gas mixture and may vary for example, from 2 to 200 atm. abs.
- the acid gases are selectively absorbed by the absorbent liquid leaving a substantially acid-free gas mixture.
- the fat absorbent liquid containing the dissolved acid gases can be readily regenerated by reducing the pressure, e.g., to one atmos. abs., whereby the absorbed gases will be substantially desorbed. If required, the pressure may be reduced stepwise, the releasing gas being carried off in each step. Stripping with an inert gas, for example nitrogen, can also be applied for the removal of the dissolved carbon dioxide and/or hydro gen sulfide, but in most cases this offers no advantages.
- the absorbent liquid possibly containing small amounts of dissolved acidic gases, can be returned into contact with the feed gas mixture and employed to absorb further amounts of acidic gases.
- absorption and desorption can be carried out continuously.
- a process for the removal of acidic gases from a gas mixture containing the same which comprises contacting said gas mixture at a pressure from 2 to 200 atmospheres absolute with a branched chain aliphatic mono-ketone of the formula wherein R, R and R are alkyl groups having 14 carbon atoms, R is hydrogen or an alkyl group having l-4 carbon atoms, R is an alkylene radical having l-4 carbon atoms and n is an integer from 0 to 1; whereby said acidic gases are selectively absorbed and a substantially acid-free gas mixture is obtained.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
WHEREIN R, R1 and R3 are alkyl groups, R2 is hydrogen or alkyl, R4 is an alkylene radical and n is an integer from 0 to 1.
Acidic gases such as carbon dioxide and hydrogen sulfide are selectively absorbed from gaseous mixtures with the use of a branched chain aliphatic mono-ketone of the formula
Acidic gases such as carbon dioxide and hydrogen sulfide are selectively absorbed from gaseous mixtures with the use of a branched chain aliphatic mono-ketone of the formula
Description
United States Patent [191 Alders et al.
[451 Sept. 25, 1973 PROCESS FOR THE REMOVAL OF ACIDIC GASES FROM A GAS MIXTURE [75] inventors: Lucas Alders, Amsterdam,
' Netherlands; Pieter Zaal, deceased,
late of Heiloo, Netherlands by (lijsberdina M. Zaal nee Weverling, personal representative, Heiloo, Netherlands [73] Assignee: SheliOil Company, New York, NY.
[22] Filed: Mar. 20, 1972 [2i] Appl. No.: 236,161
[30] Foreign Application Priority Data 5/l966 Woertz 55/48 7/1971 Ameen 55/73 X Primary Examiner-Samih N. Zaharna Assistant ExaminerRichard W. Burks Att0rneyLeonard P. Miller et al.
1 57 ABSTRACT Acidic gases such as carbon dioxide and hydrogen sulfide are selectively absorbed from gaseous mixtures with the use of a branched chain aliphatic mono-ketone of the formula Bell ' wherein R, R and R are alkyl groups, R is hydrogen or alkyl, R, is an alkylene radical and n is an integer from Oto l.
9 Claims, No Drawings PROCESS FOR THE REMOVAL OF ACIDIC GASES FROM A GAS MIXTURE BACKGROUND OF THE INVENTION The invention relates to a process for the removal of acidic gases such as carbon dioxide and/or hydrogen sulfide from a gas mixture containing such compounds.
It is well known that carbon dioxide and/or hydrogen sulfide can be removed from gas mixtures such as natural gas and synthesis gas by treatment with basic solutions. Carbon dioxide and/or hydrogen sulfide are bound to the basic materials present in the solution by chemical reaction. Regeneration of the solutions is effected by heating which causes the carbon dioxide and /or hydrogen sulfide to be released therefrom. Such methods, based on chemical absorption, are very suitable when the carbon dioxide and/or the hydrogen sulfide have a relatively low partial pressure. With higher partial pressures, however, the saturation point of the basic solutions will soon be reached. For that reason carbon dioxide and/or hydrogen sulfide at relatively high partial pressures are preferably removed from gas mixtures by physical absorption in an inert liquid. With this type of absorption the quantity of acid gases absorbed increases with the partial pressure.
Gas mixtures containing carbon dioxide and/or hydrogen sulfide at a relatively high partial pressure can result in a number of ways. For example, natural gas containing considerable quantities of carbon dioxide and/or hydrogen sulfide is often obtained at high pressures. As a rule it is necessary to remove these contaminants because hydrogen sulfide is poisonous, has an obnoxious odor and is converted to sulfur dioxide upon combustion which may contribute towards air pollution. Carbon dioxide, on the other hand, has an unfavorable influence on the calorific value of the gas per unit volume and may also give rise to undesirable deposition of solid carbon dioxide if the gas is transported in the liquid state, for example, in refrigerator ships or pipelines. Another example of a gas mixture which typically contains carbon dioxide and possibly hydrogen sulfide at high partial pressures is crude hydrogen as obtained from the shift convertor of a steam-methane reforming or gasification process. Hydrogen at high pressure is required in a number of catalytic processes in the petroleum industry, such as hydrocracking, desulfurizing and other treatments of petroleum fractions under hydrogenating conditions. The hydrogen needed is generally prepared by steam reforming of volatile hydrocarbon mixtures (for example, natural gas and light petroleum distillate fractions), or by partial oxidation of hydrocarbon mixtures, such as natural gas, fuel oil, bitumen and other materials containing carbon and hydrogen. The hydrogen which becomes available in these processes contains carbon dioxide and, depending on the starting material, may contain hydrogen sulfide as well. Any carbon dioxide and hydrogen sulfide present in the gas mixture must be substantially removed from the hydrogen stream before it is compressed, normally with the aid of reciprocating compressors to obtain a pressure which was suitable for the application of the above-mentioned petroleum refining processes. For economic reasons, it is more attractive to carry out the compression of hydrogen by means of a centrifugal compressor. As the effectiveness of such a compressor increases with the mean molecular weight of the gas to be compressed, it is'advantageous not to remove the carbon dioxide and/or hydrogen sulfide before the compression but only afterwards.
After compression the carbon dioxide and/or hydrogen sulfide have a considerable partial pressure and are therefore more desirably removed by physical absorption in an inert liquid than by chemical absorption as hereinbefore discussed.
Physical absorbents employed for the removal of carbon dioxide and/or hydrogen sulfide from hydrogen and/or hydrocarbon-containing gas mixtures such as described above, must not only have a high absorption capacity for carbon dioxide and hydrogen sulfide at high pressures, but must additionally release these gases easily when the pressure is reduced in order to effect their regeneration. Moreover, physical absorbents must also have a high selectivity for carbon dioxide and hydrogen sulfide in comparison with the absorption of hydrogen and hydrocarbons. The physical absorbent must also be chemically inert in respect of the components of the gas mixture to be treated, and must, in addition, be non-corrosive. The present invention provides a class of compounds meeting these requirements.
SUMMARY OF THE INVENTION It has now been found that acidic gases such as carbon dioxide and hydrogen sulfide can be effectively removed from a gas mixture containing the same by contacting the gas mixture with a branched chain aliphatic mono-ketone of the formula R1 4)n R3 wherein R, R and R are alkyl groups having 1-4 carbon atoms, R is hydrogen or an alkyl group having l-4 carbon atoms and wherein R is an alkylene radical having l-4 carbon atoms and n is an integer from 0 to 1; whereby the acid gases are selectively absorbed and a substantially acid gas-free gas mixture is obtained.
Branched chain aliphatic mono-ketones of the type defined by the above formula include both hydroxy ketones and ether ketones.
Examples of compounds in accordance with the invention which contain a hydroxyl group as well as a ketone group are 2-hydroxy-2-methyl-S-butanone, 3- hydroxy-3-methyl-4-hexanone, 2-hydroxy-2-methyl-5- hexanone, 3-hydroxy-3-methyl-4-octanone and 2- hydroxy-2-methyl-4-pentanone. The preferred compound in this group is 2-hydroxy-2-methyl-4- pentanone.
Examples of suitable compounds containing a ketone group and also an ether group are 2-methoxy-2-methyl- 3-butanone, 3-ethoxy-3-methyl-4-hexanone, 2- isopropoxy-2-methyl-5-hexanone and 2-methoxy-2- methyl-4-pentanone and 2-methoxy-2,3-dimethyl-4- pentanone. Of the foregoing 2-methoxy-2-methyl-4- pentanone has been found to be particularly advantageous in the present process.
Mixtures of any of the foregoing ketones can be suitably employed as well as mixtures of these ketones with any conventional absorbent.
The present process is applicable to the treatment of most any gas mixture containing acidic gas constituents as impurities. It is particularly suitable for the treatment of gas mixtures which contain hydrogen and/or normally gaseous hydrocarbons, e.g., natural gas, crude hydrogen from steam methane reforming, synthesis gas from gasification processes and the like.
While suitable for use over a relatively wide range of pressures, the advantages of the process according to the invention are greatest when the carbon cioxide and- /or the hydrogen sulfide present in the gas mixture have a considerable partial pressure. Gas mixtures which contain carbon dioxide at a partial pressure of between 2 and 70 atmospheres absolute (atm. abs.) and/or hydrogen sulfide at a partial pressure of between 1 and 35 atm. abs. are preferred.
The gas mixtures from which carbon dioxide and/or hydrogen sulfide must be removed are preferably contacted with the liquid at ambient or near-ambient temperatures, in general between 10 and 50C. Lower temperatures, for example down to 50C, are suitable, however. Naturally the ketone compound (or the mixture of ketones) with which the gas mixture is contacted must be liquid at the contact temperature. The absorption and release of the carbon dioxide and the hydrogen sulfide by the liquid according to the invention take place practically without heat effect, so that heating or cooling devices for the liquid are generally not required at operations near ambient temperature.
Contacting of the gaseous mixture with the liquid absorbent according to the invention is preferably carried out countercurrently, in an absorption tower which is provided with appropriate contact means. The liquid is generally allowed to flow or drip from top to bottom while the gas mixture to be purified passes from bottom to top. The pressure in the absorption tower is kept at that of the gas mixture and may vary for example, from 2 to 200 atm. abs. In the contacting step, the acid gases are selectively absorbed by the absorbent liquid leaving a substantially acid-free gas mixture.
The fat absorbent liquid containing the dissolved acid gases can be readily regenerated by reducing the pressure, e.g., to one atmos. abs., whereby the absorbed gases will be substantially desorbed. If required, the pressure may be reduced stepwise, the releasing gas being carried off in each step. Stripping with an inert gas, for example nitrogen, can also be applied for the removal of the dissolved carbon dioxide and/or hydro gen sulfide, but in most cases this offers no advantages.
After regeneration, the absorbent liquid, possibly containing small amounts of dissolved acidic gases, can be returned into contact with the feed gas mixture and employed to absorb further amounts of acidic gases.
If desired, absorption and desorption can be carried out continuously.
EXAMPLE I TABLE A Solubility 01 carbon dioxide at 25 C. (N1 COz/l. solvent) Pressure (atm. abs.) Solvent 1 10 20 30 i -5?J 2-liydroxy-2-mot hyl-l-pcnlnnnnt' 4 36 78 142 247 456 2-1notlinxy-2-1m-.thyl-tpont11110110.." 4 39 U6 175 324 668 EXAMPLE II TABLE B Solubility of hydrogen at 25 C. (Nl Hz/solvnnt) Pressure (atm. abs.) Selectivity COz/II: at
Solvent 10 30 50 50 atm. abs. 2hydr0xy-2-methyl-4- pentanone 0.41 1.23 2.05 2.82 3.62 222 2-Inethoxy-2-methyl4- pentanone 0.51 1.52 2.51 3.48 4. 42 266 EXAMPLE III The solubility of hydrogen sulfide in the ketones of Example I was determined at 25C and various pressures. The data of Table C shows that a considerable quantity of hydrogen sulfide is absorbed by the ketone solvent at high pressures and that the hydrogen sulfide is substantially desorbed by reducing the pressure to atmospheric.
TABLE 0 Solubility of hydrogen sulfide at 25 C. (NI IIzS/l. solvent) Pressure (atm. abs.)
Solvent 1 3 6 E) 2-liydroxy-2-n1etliyl-4p0ntanonc.
EXAMPLE IV TABLE D Solubility of carbon dioxide at 25 0. (N1 COz/lsolvent) 2-methoxy- CO2 partial 2-metl1yl-4- 2-1s0butoxypressure, bar pentanone B-hutanone From the above data it is evident that the solubility of carbon dioxide in the etherketone according to the invention is appreciably higher than the CO -solubility in 2-isobutoxy-3-butanone.
We claim as our invention:
1. A process for the removal of acidic gases from a gas mixture containing the same which comprises contacting said gas mixture at a pressure from 2 to 200 atmospheres absolute with a branched chain aliphatic mono-ketone of the formula wherein R, R and R are alkyl groups having 14 carbon atoms, R is hydrogen or an alkyl group having l-4 carbon atoms, R is an alkylene radical having l-4 carbon atoms and n is an integer from 0 to 1; whereby said acidic gases are selectively absorbed and a substantially acid-free gas mixture is obtained.
2. The process of claim 1 wherein the gas mixture is a hydrogen or hydrocarbon-containing gas mixture.
3. The process of claim 2 wherein the contacting of the gas mixture with the branched chain aliphatic mono-ketone is effected at a temperature between and 50C.
4. The process of claim 3 wherein the selectively absorbed acidic gases are desorbed from the branched chain aliphatic mono-ketone by a reduction in pressure and the regenerated ketone is returned into contact with the feed gas mixture.
5. The process of claim 4 wherein the gas mixture contains carbon dioxide at a partial pressure between 2 and atmospheres absolute.
6. The process of claim 4 wherein the gas mixture contains hydrogen sulfide at a partial pressure between l and 35 atmospheres absolute.
7. The process of claim 1 wherein the branched chain aliphatic mono-ketone is 2-hydroxy-2-methyl-4- pentanone.
8. The process of claim 1 wherein the branched chain aliphatic mono-ketone is 2-methoxy-2-methyl-4- pentanone.
9. The process of claim 5 wherein the branched chain aliphatic mono-ketone is 2-methoxy-2-methyl-4- pentanone.
Claims (9)
1. A process for the removal of acidic gases from a gas mixture containing the same which comprises contacting said gas mixture at a pressure from 2 to 200 atmospheres absolute with a branched chain aliphatic mono-ketone of the formula
2. The process of claim 1 wherein the gas mixture is a hydrogen or hydrocarbon-containing gas mixture.
3. The process of claim 2 wherein the contacting of the gas mixture with the branched chain aliphatic mono-ketone is effected at a temperature between 10* and 50*C.
4. The process of claim 3 wherein the selectively absorbed acidic gases are desorbed from the branched chain aliphatic mono-ketone by a reduction in pressure and the regenerated ketone is returned into contact with the feed gas mixture.
5. The process of claim 4 wherein the gas mixture contains carbon dioxide at a partial pressure between 2 and 70 atmospheres absolute.
6. The process of claim 4 wherein the gas mixture contains hydrogen sulfide at a partial pressure between 1 and 35 atmospheres absolute.
7. The process of claim 1 wherein the branched chain aliphatic mono-ketone is 2-hydroxy-2-methyl-4-pentanone.
8. The process of claim 1 wherein the branched chain aliphatic mono-ketone is 2-methoxy-2-methyl-4-pentanone.
9. The process of claim 5 wherein the branched chain aliphatic mono-ketone is 2-methoxy-2-methyl-4-pentanone.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7103928A NL7103928A (en) | 1971-03-24 | 1971-03-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3760564A true US3760564A (en) | 1973-09-25 |
Family
ID=19812750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00236161A Expired - Lifetime US3760564A (en) | 1971-03-24 | 1972-03-20 | Process for the removal of acidic gases from a gas mixture |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3760564A (en) |
| JP (1) | JPS5523657B1 (en) |
| BE (1) | BE781050A (en) |
| CA (1) | CA961238A (en) |
| DE (1) | DE2213949B2 (en) |
| FR (1) | FR2130545B1 (en) |
| GB (1) | GB1382684A (en) |
| IT (1) | IT950685B (en) |
| NL (1) | NL7103928A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4711648A (en) * | 1985-09-14 | 1987-12-08 | Ruhrechemie Aktiengesellschaft | Process for purification of gases |
| US6102987A (en) * | 1997-12-05 | 2000-08-15 | Krupp Uhde Gmbh | Process for the removal of CO2 and sulfur compounds from industrial gases, in particular from natural gas and raw synthesis gas |
| US9738837B2 (en) | 2013-05-13 | 2017-08-22 | Cenovus Energy, Inc. | Process and system for treating oil sands produced gases and liquids |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2649166A (en) * | 1950-05-02 | 1953-08-18 | Allied Chem & Dye Corp | Absorption of carbon dioxide from gases containing the same |
| US3242644A (en) * | 1962-12-27 | 1966-03-29 | Union Oil Co | Process for removing acid constituents from gaseous mixtures |
| US3252269A (en) * | 1962-12-27 | 1966-05-24 | Union Oil Co | Removal of acid constituents from gas mixtures using acetoxy acetone |
| US3594985A (en) * | 1969-06-11 | 1971-07-27 | Allied Chem | Acid gas removal from gas mixtures |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1938614A1 (en) * | 1969-07-30 | 1971-02-11 | Basf Ag | Process for the separation of CO2 and / or H2S from gases |
-
1971
- 1971-03-24 NL NL7103928A patent/NL7103928A/xx not_active Application Discontinuation
-
1972
- 1972-03-20 US US00236161A patent/US3760564A/en not_active Expired - Lifetime
- 1972-03-22 IT IT22292/72A patent/IT950685B/en active
- 1972-03-22 FR FR7210004A patent/FR2130545B1/fr not_active Expired
- 1972-03-22 JP JP2824272A patent/JPS5523657B1/ja active Pending
- 1972-03-22 BE BE781050A patent/BE781050A/en unknown
- 1972-03-22 CA CA137,830A patent/CA961238A/en not_active Expired
- 1972-03-22 GB GB1337372A patent/GB1382684A/en not_active Expired
- 1972-03-22 DE DE2213949A patent/DE2213949B2/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2649166A (en) * | 1950-05-02 | 1953-08-18 | Allied Chem & Dye Corp | Absorption of carbon dioxide from gases containing the same |
| US3242644A (en) * | 1962-12-27 | 1966-03-29 | Union Oil Co | Process for removing acid constituents from gaseous mixtures |
| US3252269A (en) * | 1962-12-27 | 1966-05-24 | Union Oil Co | Removal of acid constituents from gas mixtures using acetoxy acetone |
| US3594985A (en) * | 1969-06-11 | 1971-07-27 | Allied Chem | Acid gas removal from gas mixtures |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4711648A (en) * | 1985-09-14 | 1987-12-08 | Ruhrechemie Aktiengesellschaft | Process for purification of gases |
| AU587063B2 (en) * | 1985-09-14 | 1989-08-03 | Ruhrchemie Aktiengesellschaft | Process for purification of gases |
| US6102987A (en) * | 1997-12-05 | 2000-08-15 | Krupp Uhde Gmbh | Process for the removal of CO2 and sulfur compounds from industrial gases, in particular from natural gas and raw synthesis gas |
| US9738837B2 (en) | 2013-05-13 | 2017-08-22 | Cenovus Energy, Inc. | Process and system for treating oil sands produced gases and liquids |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1382684A (en) | 1975-02-05 |
| NL7103928A (en) | 1972-02-25 |
| FR2130545A1 (en) | 1972-11-03 |
| DE2213949B2 (en) | 1980-08-07 |
| FR2130545B1 (en) | 1974-09-13 |
| BE781050A (en) | 1972-09-22 |
| JPS5523657B1 (en) | 1980-06-24 |
| IT950685B (en) | 1973-06-20 |
| CA961238A (en) | 1975-01-21 |
| DE2213949A1 (en) | 1972-09-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4091073A (en) | Process for the removal of H2 S and CO2 from gaseous streams | |
| SU1309902A3 (en) | Absorbent for selective separation of hydrogen sulphide | |
| US4372925A (en) | Process for the removal of acid gases from gas mixtures containing methane | |
| US3416293A (en) | Sulfur adsorption | |
| US4080424A (en) | Process for acid gas removal from gaseous mixtures | |
| US3965244A (en) | Selective removal of sulfur compounds from acid gas mixtures containing significant quantities of carbonyl sulfide | |
| US4425317A (en) | Recycle of hydrogenated sulfur plant tail gas to sour gas scrubbing system | |
| US4368178A (en) | Process for the removal of H2 S and CO2 from gaseous streams | |
| JPH0364168B2 (en) | ||
| US3324627A (en) | Process for the purification of gases | |
| EA013794B1 (en) | Removal of carbon dioxide from a gas stream | |
| EA019187B1 (en) | Process for producing purified natural gas | |
| JP6679572B2 (en) | Removal of hydrogen sulfide and carbon dioxide from fluid streams | |
| US4241032A (en) | Process for the removal of hydrogen sulfide from gas streams | |
| EA012698B1 (en) | Configurations and methods for removal of mercaptans from feed gases | |
| US4345918A (en) | Process for purification of gas streams | |
| KR20090051048A (en) | How to Remove Oxygenate from Paraffin Stream | |
| US4020144A (en) | Method for removal of gaseous sulfur and nitrogen compounds from gas streams | |
| CN1754947B (en) | Process and installation for the treatment of DSO | |
| US4025322A (en) | Removal of hydrocarbons and water from acid gas streams | |
| JPS6139093B2 (en) | ||
| US3660276A (en) | Purification of hydrocarbon oils | |
| US3760564A (en) | Process for the removal of acidic gases from a gas mixture | |
| KR890009819A (en) | Steam Reforming of Hydrocarbons | |
| US3387917A (en) | Method of removing acidic contaminants from gases |